NICOLE RICHIE

ROLL OVER photo to reveal THE RING!

After three years and two children together (daughter Harlow, 2, and son Sparrow, 9 months), Richie and Joel Madden are making it official. The 28-year-old mom confirmed the news while taping a Late Show with David Letterman appearance in February, while Madden talked about the happy event on Twitter, telling fans: "Yep. i'm engaged. Very happy."